CVE-2026-25866: MobaXterm versions prior to 26.1 contain an uncontrolled search path element vulnerability

Q: How do I fix CVE-2026-25866?

mobaxterm: upgrade to 26.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-25866 being exploited?

CVE-2026-25866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-25866 affect?

CVE-2026-25866 affects mobaxterm. Severity is high (CVSS 7.8). MobaXterm versions prior to 26.1 contain an uncontrolled search path element vulnerability. The application calls WinExec to execute Notepad++ without a fully qualified executable path when opening remote files. An attacker can exploit the

Routine

HIGH 7.8UPGRADE

CVE-2026-25866 is a high-severity flaw (CVSS 7.8) affecting mobaxterm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MobaXterm versions prior to 26.1 contain an uncontrolled search path element vulnerability. The application calls WinExec to execute Notepad++ without a fully qualified executable path when opening remote files. An attacker can exploit the search path behavior by placing a malicious executable earlier in the search order, resulting in arbitrary code execution in the context of the affected user.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-428
Published	2026-03-09
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: mobatek

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-09 16:16 UTCPublished CVE record published
2026-06-17 10:25 UTCUpdated Record last modified

mobatek mobaxterm UPGRADE

Affected: < 26.1

Fixed in: 26.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mobaxterm || rpm -q mobaxterm || mobaxterm --version

2. UPGRADE to 26.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mobaxterm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mobaxterm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-25866?

mobaxterm: upgrade to 26.1. Exact commands for each OS are on this page.

Is CVE-2026-25866 being exploited?

CVE-2026-25866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-25866 affect?

CVE-2026-25866 affects mobaxterm. Severity is high (CVSS 7.8). MobaXterm versions prior to 26.1 contain an uncontrolled search path element vulnerability. The application calls WinExec to execute Notepad++ without a fully qualified executable path when opening remote files. An attacker can exploit the

How urgent is CVE-2026-25866?

Priority 28/100. High severity

Software pages

Notepad++ vulnerabilities

References

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